I read over the guide on this site for making DVD files with TMPGEnc. I choose my settings and then tried to import the file into DVDit! PE. DVDit! won't take the file. It complains that "DVDit! cannot use this file. It appears to be an MPEG file, but is not identifiable as NTSC or PAL"I have had no problems until I made the changes getting files into DVDit! so I know I changed something. I've tried making small changes but with no luck. Does anyone have any experience with this? Maybe an idea of what I can check. Some of the changes I made was:

Enocde mode: Interlace and non-interlace.
Changes in the GOP settings I:1 P:7 B:3
opened and closed GOP
Turned on/off the output YUV data as Basic YCbCr not CCIR601
Quantize matrix set to default and CG/Animation